Change in the number of characters that fit into the column width after upgrading Confluence.

Issue Summary

When Confluence is upgraded from v7.19.0 to v8.5.5, the number of characters that fit into the column width of the tables change.

This is reproducible on Data Center: yes

Steps to Reproduce (Upgrading Confluence):

In Confluence v7.19:

1. Create a Page.
2. Add a Table with enough data (or use the below storage format)
   • 
3. Upgrade Confluence to v8.5.5.

Steps to Reproduce (Using Storage Format):

1. Import the below storage format in Confluence v7.19 and v8.5.5 to notice the difference.

   • <h1><strong>Version History</strong></h1>
     <table class="wrapped fixed-table"><colgroup><col style="width: 73.0px;" /><col style="width: 94.0px;" /><col style="width: 309.0px;" /><col style="width: 114.0px;" /></colgroup>
     <tbody>
     <tr>
     <th>Version</th>
     <th>Date</th>
     <th>Description</th>
     <th>Author</th></tr>
     <tr>
     <td>1.0</td>
     <td>2023-04-27</td>
     <td>Document creation.</td>
     <td>Test the Column Width</td></tr>
     <tr>
     <td><br /></td>
     <td><br /></td>
     <td><br /></td>
     <td><br /></td></tr>
     <tr>
     <td colspan="1"><br /></td>
     <td colspan="1"><br /></td>
     <td colspan="1"><br /></td>
     <td colspan="1"><br /></td></tr></tbody></table>
     

Expected Results

The table displays as it was displayed in v7.19.

Actual Results

• Table column width with in the table changes as below.
  • 
• We observed the number of pixels required in Confluence v7.19 and v8.5 to fit the characters within the column is different.
  • Confluence v7.19 requires 73.0px

    • <table class="wrapped fixed-table"><colgroup><col style="width: 73.0px;" /><col style="width: 94.0px;" /><col style="width: 309.0px;" /><col style="width: 114.0px;" /></colgroup>
      

  • Confluence 8.5 requires 88.0px

    • <table class="wrapped fixed-table"><colgroup> <col style="width: 88.0px;" /> <col style="width: 94.0px;" /> <col style="width: 309.0px;" /> <col style="width: 114.0px;" /> </colgroup>
      

Workaround

The current workaround is to modify the column width manually. However, there is no workaround to make changes to multiple tables/pages.